GTK: Add download notifications to the unity dock.

chrome/browser/ui/gtk/unity_dock_service.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/gtk/unity_dock_service.h"
+
+#include <dlfcn.h>
+
+#include "base/environment.h"
+#include "base/scoped_ptr.h"
+#include "chrome/browser/shell_integration.h"
+
+void UnityDockService::SetDownloadCount(int count) {
+  if (chrome_entry) {
+    entry_set_count(chrome_entry, count);
+    entry_set_count_visible(chrome_entry, count != 0);
+  }
+}
+
+void UnityDockService::SetProgressPercent(float percentage) {
+  if (chrome_entry) {
+    entry_set_progress(chrome_entry, percentage);
+    entry_set_progress_visible(chrome_entry,
+                               percentage > 0.0 && percentage < 1.0);
+  }
+}
+
+UnityDockService::UnityDockService() {}
+
+UnityDockService::~UnityDockService() {}
+
+// static
+DockService* UnityDockService::Build() {
+  UnityDockService* service = NULL;
+  void* unity_lib = dlopen("libunity.so.4", RTLD_LAZY);
+  if (unity_lib) {

[Evan Martin, 2011/04/26 00:33:52]

Why not early return here rather than nesting so much?

+    unity_launcher_entry_get_for_desktop_id_func entry_get_for_desktop_id =
+        reinterpret_cast<unity_launcher_entry_get_for_desktop_id_func>(
+            dlsym(unity_lib, "unity_launcher_entry_get_for_desktop_id"));
+
+    if (entry_get_for_desktop_id) {
+      scoped_ptr<base::Environment> env(base::Environment::Create());
+      std::string desktop_id = ShellIntegration::GetDesktopName(env.get());
+      UnityLauncherEntry* entry = entry_get_for_desktop_id(desktop_id.c_str());
+
+      unity_launcher_entry_set_count_func entry_set_count =
+          reinterpret_cast<unity_launcher_entry_set_count_func>(
+              dlsym(unity_lib, "unity_launcher_entry_set_count"));
+
+      unity_launcher_entry_set_count_visible_func entry_set_count_visible =
+          reinterpret_cast<unity_launcher_entry_set_count_visible_func>(
+              dlsym(unity_lib, "unity_launcher_entry_set_count_visible"));
+
+      unity_launcher_entry_set_progress_func entry_set_progress =
+          reinterpret_cast<unity_launcher_entry_set_progress_func>(
+              dlsym(unity_lib, "unity_launcher_entry_set_progress"));
+
+      unity_launcher_entry_set_progress_visible_func
+          entry_set_progress_visible =
+          reinterpret_cast<unity_launcher_entry_set_progress_visible_func>(
+              dlsym(unity_lib, "unity_launcher_entry_set_progress_visible"));
+
+      // Check every returned method because the API is unstable.
+      if (entry &&
+          entry_set_count &&
+          entry_set_count_visible &&
+          entry_set_progress &&
+          entry_set_progress_visible) {
+        service = new UnityDockService;
+        service->chrome_entry = entry;
+        service->entry_set_count = entry_set_count;
+        service->entry_set_count_visible = entry_set_count_visible;
+        service->entry_set_progress = entry_set_progress;
+        service->entry_set_progress_visible = entry_set_progress_visible;
+      }
+    }
+  }
+
+  return service;
+}
+